3R3-62417-0 Nissan BUSING, 28-31-35

Illustration 1 g00631341
Test Step 1. Inspecting Electrical Connectors
Verify that the circuit breakers are not tripped.
Turn the circuit breaker at the battery to the OFF position.
Turn the ECS to the OFF/RESET position.
Check the components and wiring for the following problems: damage, corrosion, abrasion and incorrect attachmentExpected Result:The components and wiring should be free of the following problems: damage, corrosion, abrasion and incorrect attachment.Results:
OK - Proceed to test step 2.
Not OK - Repair: Repair the connectors and/or wiring or replace the connectors and/or wiring. Stop.Test Step 2. Check the Voltage.
Turn the circuit breaker at the battery to the ON position.
Connect the black probe of the multimeter to the +Battery terminal of the Speed Control. Connect the red probe of the multimeter to the -Battery terminal of the Speed Control.Expected Result:The voltage should be 24 5 VDC.Results:
OK - The voltage supply to the Speed Control is correct. Proceed to test step 3.
Not OK - Repair: The voltage is not correct. There is a problem with the supply voltage to the Speed Control. Stop.Test Step 3. Determine the Component that has Failed.
Determine if the problem is with the input for the throttle or the Droop.
Select "UNSURE" if the source of the problem is unknown.Expected Result:Results:
RATED SPEED - Proceed to test step 4.
DROOP SPEED - Proceed to test step 5.
Unsure - Proceed to test step 4.Test Step 4. Check the Throttle Position.
Turn the ECS to the STOP position.
Observe the position of the throttle on the ET.
Turn the Speed Adjust Potentiometer to the lowest setting.
60 Hz equals 1369 RPM
50 Hz equals 1141 RPM
Start at the low idle position. Slowly turn the Speed Adjust Potentiometer in the other direction. Monitor the position of the throttle on the ET.Expected Result:The Throttle Position on the ET should read 0 percent at the lowest setting and 0 to 100 percent as the Speed Adjust Potentiometer is adjusted.Results:
OK - The Speed Control is operating correctly. Stop.
Not OK - Proceed to test step 6.Test Step 5. Check the Droop.
Turn the ECS to the STOP position.
Observe the Droop on the ET.
Turn the Droop Adjust Potentiometer in a counterclockwise direction.
Slowly turn the Droop Adjust Potentiometer in a clockwise direction. Monitor the Droop on the ET. Note: Do not overturn the Droop Adjust Potentiometer in the clockwise direction. The signal will become erratic.Expected Result:The Droop on the ET should read 0 percent at the lowest setting and 0 to 10 percent as the Potentiometer is adjusted.Results:
OK - The Droop is operating correctly. Stop.
Not OK - Proceed to test step 7.Test Step 6. Check the Speed Control.
Remove the wire from the S terminal at the Speed Control.
Set the multimeter to "VDC". Press the "Hz" button twice so that the % symbol is displayed.
Place one probe of the multimeter on the S terminal of the Speed Control. Place the other probe on the -Battery terminal of the Speed Control.
Monitor the output of the percent duty cycle from the Speed Control on the multimeter. Turn the potentiometer from the low setting to